Cqffee-roaster



2 Sheets-Sheet 1.

"O. L. HALL.

- O0ffee Roaster. No. 231,486. Patented Aug. 24,1880.

N, PHERS PHOYO-LI'THOGRAPHER. WASHINGTON. D. C.

2 Sheets-Sheet 2.

G. L. HALL. Oo ffee Roaster.

'No. 231,486. Patented Aug. 2411880.

lil

MUIIIIIIIIIIIfl/b jazz 12712707 @ZM JIIIIIIIIIIIIIIIIIL N-PETERSI FHOTOllTNOGRIHER, WASHINGTON, D C.

UNITED STATES PATENT OFFICE.

GASSIUS L. HALL, OF YPSILANTI, MICHIGAN.

CQFFEE-ROASTER.

SPECIFICATION forming part of Letters Patent No. 231,486, dated August 24, 1880.

Application filed December 15, 1879.

To all whom tt may concern:

Be it known that I, GAssIUs L. HALL, of Ypsilanti, in the county of Washtenaw and State of Michigan, have invented an Improvement in Coffee-Roasters, of which the following is a specification.

The nature of this invention relates to certain new and useful improvements in the construction of coi'lee-roasters; and the invention consists in the peculiar construction, arrangement, and con'lbinations of the various parts, all as more fully hereinafter set forth.

In the drawings, Figure 1 is a front perspective view. Fig. 2 is a rear perspective. Fig. 3 is an elevation of the rear end with the gearing removed. Fig. -ilS a vertical cross-section through one of the smoke-fines. Fig. 5 is a central vertical longitudinal section. Fig. 6 is a longitudinal central section of the shaft with hopper removed. Fig. 7 is a cross-section on line to w in Fig. 5.

In the accompanying drawings, which form a part of this specification, A represents the furnace-chamber, B the grate, O the furnace, and D the ash-doors, which allow easy access to the ash-pit.

The furnace-chamber extends all around the roasting-cylinder, and is provided at top with two exit-tines, O C, which are so located at each end as to distribute the heat evenly by carrying the hot gases of combustion away from the center, and thus prevent central overheating, as is generally the case where but one central smoke-flue is provided.

The furnace-chamber Ais lined on the sides from top of grate to the base of smoke-flues with a fire-proof composition, A, of sufficient thickness to prevent the destruction of the oven by the direct heat when the draft-fines are closed.

F is an air-chamber, which surrounds the furnace-chamber on both sides, and is provided on top, each side of the smoke-fines, with the dampers Gr, through which the air is fed under the furnace below. By this arrangement I prevent a great loss of heat from radiation to the outside, while the air, which in its downward course impinges against the heated walls of the furnace-chamber, is fed in a highly-heated condition.

The roasting-cylinder, consisting of an outer shell, J, and inner shell, K, both attached to the heads L and M and mounted on a central shaft, is made to rotate freely inside the cylindrical portion of the furnace-chamber, leaving room enough for the heated gases of combustion to pass around said cylinder on all sides. Thus when the roasting-cylinderis properly rotating I prevent all chances of burning the roasting material by presenting the entire surface of the roasting-cylinder in succession to the action of the heat.

The outer shell, J, of the roasting-cylinder is preferably made of sheet metal, and may or may not be provided with perforations to allow the exit of steam and other gases liberated by the process of roasting. The inner shell, K, of the roasting-cylinder is made of wireeloth or perforated sheet metal. Both the outer and inner shells of the roasting-cylinder are attached to the heads L and M by means of the flanges a, cast thereon, and are also stayed by the radial stays b, which are screwed into the collars c c, and confine the wire-cloth between an outer and inner nut screwed on the outer ends of the stays, a circular band being interposed between the wire-cloth and outer nut. By this arrangement I prevent all sagging or vibration of the wire-cloth.

The stays b are also used for attaching the stirringwingsf, which extend in the intervals between the stays and stays and heads, and are made of strips of sheet metal, making onequarter turn from one point of attachment to the other.

The roasting-cylinder is mounted on a shaft which consists of the two slotted sections N and O, joined by the section P, which is of smaller diameter, so as to screw at one end into the section H, while the other end is supported by a plug, it, projecting from the end of the section 0, on which it can freely turn.

By this arrangement the shaft can readily be lengthened and the wirecloth thereby be stretched, as is always found necessary to do after the latter has been put in place.

The front head, M, is slotted, and is provided with a circular damper, M, similarly slotted, and arranged so as to close or disclose the slots in the head, as may be desired.

This damper is held in its position and its pressure upon the head M is regulated by means of a washer-plate, e, which slips over the portion 0 of the shaft, and is secured in place by bolts or screws passing through the same and threaded into the head.

The outer end of the shaft (7) is held in its position bythe box K, in which it is also properlyjournaled, said box being secured in the lower end of a hanger, I, projecting from and secured to the top of the outer casing, as shown in Figs. 5 and l.

The portion N of the shaft of the roastingcylinder projects through a vertical elongated opening, m, in the end wall of the case, and receives on its end a box, 11, and a geared wheel, R, which meshes with a smaller geared wheel or pinion, S, rigidly secured to a shaft, T, and journaled in the boxes 12 p, which are adjustably secured to and project from the side of the machine. A lever, u, sleeved upon one end of the box 1), passes beneath the box n, and engages at its opposite end with the short arm ofa lever, V, pivoted to the side of the outer case, and having for its object the raising or lowering of the rear end of the roasting-cylinder.

A slide-gate, r, keeps the elongated opening at in the rear end of the case closed when the cylinder is lowered, while the half-ring .s', pivoted to the front side of the case, does the same function for the opening in front of the case through which the roasting-eyliluler projects, and which is also slightly elongated to give the necessary play to allow the raising and lowering of the roasting-cylinder.

Upon one end of the shaft T is secured a crank-handle, by means of which said shaft, and through its connections, the roasting-cylinder is rotated.

In the portion Nof the shaft 1 secure a wormfeed,VV, which revolves with the shaft. The spout X of a hopper is inserted in the shaft N, surrounding the worm-feed, and is so secured that it will not revolve with it. This causes the worm to draw in the material to be roasted and deposit it within the cylinderthrough the opening u in the shaft.

This end of the cylinder maybe elevated, if desired, to accelerate the feed; but it is not necessary.

When the material introduced is sutliciently roasted the rear end of the roastiiig-cylinder is elevated, the damper-slide in the front end opened, and the material, by continued rotations of the cylinder, is expelled.

If it is desired to test the material during the operation of roasting the tryer or scoopplug (not shown) is withdrawn, and with it a small portion of the material in the roastingcylindcr, which finds its way into the hollow shaft 0 by the slots or openings 1W therein.

What I claim as my invention is 1. A coffee-roasting device provided witha hollow shaft, substantially as described, and a worm-feed, \V, for delivering the material to be roasted to the cylinder, substantially as specified.

2. In a cotfee-roastingdevice, the tines leading from or near the top thereof to the ash-pit below the grate, for carrying heated air thereto, and surrounding the shell A, which incloses a revolving cylinder, substantially as and for the purposes set forth.

3. A coffee-roaster provided with a holder for the unroastcd coffee and a revolving cylinder, K, having one of its journals mounted in vertically-adjustable bearings, whereby its inclination maybe changed to regulate the feed of the coffee from said hohler into the cylinder, substantially as described.

4. The combination, with the cylinder K and journals N O, of the adjustable bearing a, levers u V, and catch a, substantially as described.

5. The combination of the cylinder K, having journals N O, with the swinging bearing K, adjustable bearing a, levers u and V, and catch a, all constructed and arranged substantially as specified.

(i. In a coffee-roastingdevice, the shaft, consisting of three sections, N O P, constructed and operating as described, in combination with the cylinder-heads of the roasting-cylinder K, for the purpose of expanding end wise the said cylinder when necessary, substantially as set forth.

7. A coffee-roaster provided with a cylinder, K, having a hollow journal which has an opening into the cylinder, and a feeding device arranged, substantially as described, to feed through the journal, substantially as specified.

S. A cofi'ee -roaster provided with a cylinder, K, having two hollow journals, N 0, each provided with an opening into the cylinder, one for thejournal which admits the coffee to the cylinder and the other for removing the contents for examination, substantially as specified.

CASSIUS L. HALL. Witnesses H. S. SPRAGUE, A. BARTHEL. 

